Monumental

usgb/ˌmɑːnjuˈmentl/Volume
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Impressive ScalePlay
Used to describe things that are so big they amaze people, like wonders of the world. SlideThe Great Wall of China is a monumental feat of ancient engineering.
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Intense EffortPlay
Refers to tasks that require a lot of work and dedication to complete. SlideOrganizing the Olympics is a monumental effort.